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CVE-2026-74406— vxlan: Fix potential null-ptr-deref in vxlan_gro_prepare_receive().

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Linux kernel是美国Linux基金会开源的一个操作系统内核。 Linux kernel存在安全漏洞，该漏洞源于vxlan_gro_prepare_receive()未检查sk_user_data是否为空，该值可能被udp_tunnel_sock_release()设为NULL，可能导致空指针取消引用。

CVSS 9.8 · Critical EPSS 0.50% · P41

Possible ATT&CK Techniques 1 AI

T1068 · Exploitation for Privilege Escalation

Affected Version Matrix 14

VendorProduct Version RangeStatus
Linux Linux 5602c48cf87562c2f95b831d690631935e834295< 9c58c729d32e7cea5772cc44929c6cd61e5a31cd affected
5602c48cf87562c2f95b831d690631935e834295< f79c80f173fda9545b220c1f094b65fc06c252d0 affected
5602c48cf87562c2f95b831d690631935e834295< 08f40c0d23c67c3aa4224c3311e134999c721fb4 affected
5602c48cf87562c2f95b831d690631935e834295< 4a8cde6f7281ea2c4c290f9ad9923b3631defceb affected
5602c48cf87562c2f95b831d690631935e834295< ef44dac2a37f86eeae6b88ed10a6d60b35387dfd affected
5602c48cf87562c2f95b831d690631935e834295< 30a45c0bffdd62350261e2f2689fdba426a33578 affected
4.7 affected
< 4.7 unaffected
… +6 more rows
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I. Basic Information for CVE-2026-74406

Vulnerability Information
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Vulnerability Title
vxlan: Fix potential null-ptr-deref in vxlan_gro_prepare_receive().
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: vxlan: Fix potential null-ptr-deref in vxlan_gro_prepare_receive(). udp_tunnel_sock_release() could set sk->sk_user_data to NULL while vxlan_gro_prepare_receive() is running. Let's check if rcu_dereference_sk_user_data() is NULL after skb_gro_remcsum_init().
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会开源的一个操作系统内核。 Linux kernel存在安全漏洞，该漏洞源于vxlan_gro_prepare_receive()未检查sk_user_data是否为空，该值可能被udp_tunnel_sock_release()设为NULL，可能导致空指针取消引用。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux 5602c48cf87562c2f95b831d690631935e834295 ~ 9c58c729d32e7cea5772cc44929c6cd61e5a31cd -
Linux Linux 4.7 -

II. Public POCs for CVE-2026-74406

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III. Intelligence Information for CVE-2026-74406

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Patches & Fixes for CVE-2026-74406 (6)

Same Patch Batch · Linux · 2026-08-15 · 845 CVEs total

CVE-2026-72421 10.0 CRITICAL ipv4: fib: Don't ignore error route in local/main tables.
CVE-2026-72408 10.0 CRITICAL geneve: gate GRO hint in geneve_gro_complete() on gs->gro_hint
CVE-2026-74309 10.0 CRITICAL vdpa/octeon_ep: fix IRQ-to-ring mapping in interrupt handler
CVE-2026-72407 10.0 CRITICAL geneve: validate inner network offset in geneve_gro_complete()
CVE-2026-74279 10.0 CRITICAL crypto: cavium/cpt - fix DMA cleanup using wrong loop index
CVE-2026-74475 10.0 CRITICAL vxlan: use neigh_ha_snapshot() in route_shortcircuit()
CVE-2026-74280 10.0 CRITICAL crypto: marvell/octeontx - fix DMA cleanup using wrong loop index
CVE-2026-72493 9.9 CRITICAL net: serialize netif_running() check in enqueue_to_backlog()
CVE-2026-74361 9.8 CRITICAL nvme: fix FDP fdpcidx bounds check
CVE-2026-74268 9.8 CRITICAL tcp: clear sock_ops cb flags before force-closing a child socket
CVE-2026-72064 9.8 CRITICAL net: mana: Sync page pool RX frags for CPU
CVE-2026-72065 9.8 CRITICAL net: mana: Validate the packet length reported by the NIC
CVE-2026-72069 9.8 CRITICAL locking/rt: Fix the incorrect RCU protection in rt_spin_unlock()
CVE-2026-72185 9.8 CRITICAL ntfs: fix WARN_ON for resident attribute in ntfs_map_runlist_nolock()
CVE-2026-72249 9.8 CRITICAL netfilter: flowtable: use dst in this direction when pushing IPIP header
CVE-2026-72494 9.8 CRITICAL RDMA/irdma: Replace waitqueue and flag with completion
CVE-2026-72248 9.8 CRITICAL netfilter: flowtable: support IPIP tunnel with direct xmit
CVE-2026-72491 9.8 CRITICAL net/9p: fix race condition on rdma->state in trans_rdma.c
CVE-2026-72251 9.8 CRITICAL netfilter: nf_nat_sip: reload possible stale data pointer
CVE-2026-74480 9.8 CRITICAL net: bridge: stop fast-leave after deleting a port group

Showing top 20 of 845 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

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